Playing a Voodan or a Favored Soul, the custom feats that are required to level up are unavailable to select. Turn Spirit is not listed for Voodan at level 2, and Favored Weapon is not listed for Favored Souls.
Edit: Favored Weapon is allowed at 3, disregard that. However, Voodans, at least one I know of, still cannot take Turn Spirit feats.